ES2688981T3 - Cleaning implementation with fog generator system - Google Patents

Abstract

A cleaning utensil (500, 600, 700, 800) comprising: a housing for moving on a surface to be cleaned; and a housing mounted fog generation system (400) and comprising: a tank (16) for containing a liquid supply (56), the tank (16) having a tank inlet (414) and a first outlet (444) tank; an atomizer nozzle (442) in fluid communication with the first tank outlet (444) and configured to atomize liquid to form an atomized mist and have a nozzle outlet (464) to atomize the atomized mist; and an air pump (422) in fluid communication with the tank inlet (414) to supply air to the tank (16); wherein, when the air pump (422) has pressurized the liquid supply (56) in the tank (16), liquid is provided to the atomizer nozzle (442) through the first tank outlet (444) .

Description

DESCRIPTION

Cleaning implementation with fog generator system Background of the invention

Conventional vacuum cleaners may comprise a rotationally operated agitator to stir debris 5 on a surface to be cleaned. The agitator can be turned at high speed so that dirt is released from the surface and more easily ingested in the vacuum. However, agitation of the surface to be cleaned, such as the carpet, for example, tends to disturb the dust and dirt trapped in the fibers of the carpet. Therefore, the agitation process can generate airborne particles such as dust particles, carpet lint, pet dander and other allergens that can contaminate the ambient air surrounding the vacuum. Small and light particles can float upwards from the surface to be cleaned and an operator can inhale them. Similarly, removing dust with a conventional dust mop, a flat mop or a control duster can also disturb the dust particles on the surface to be cleaned, causing the particles to float up and pollute the atmosphere. In some cases, operators may be sensitive to these airborne particles - especially those who have allergies or other respiratory sensitivities.

Additionally, in addition to generating airborne particles, the vacuum cleaning process can also generate bad odors. A conventional vacuum cleaner comprises a suction source to generate a working air flow through a working air path. The vacuum cleaner is adapted to trap dust, debris and allergens through a suction nozzle in the working air flow. The particles 20 entrained in the work air flow are separated and collected in a cup of dirt. Separate discharge air is discharged through the suction source and one or more optional filters downstream. Bad odors can be released when the cleaning surface is disturbed. In addition, the work air flow can release bad odors as the air flows through the system, colliding with various obstructions and discharging into the ambient atmosphere. Excessive odors can create an unpleasant user experience for an operator.

US 20060185113 discloses a cleaning tool with a fog generating system. The device includes an extractor with a tank, an air pump that pressurizes the tank and a nozzle that can spray liquid, fog or steam.

Summary of the Invention

A cleaning tool according to an embodiment of the invention comprises a housing for movement on a surface to be cleaned and a mist generating system mounted in the housing. The fog generator system may comprise a tank to accommodate a liquid supply, where the tank has a tank inlet and a first tank outlet, an atomizing nozzle in fluid communication with the first outlet and having a nozzle outlet to atomize a mist and an air pump in fluid communication with the inlet of the tank to supply air to the tank, in which, when the air pump has pressurized the supply of liquid in the tank, liquid is provided to the atomizing nozzle through of the first exit of the tank.

Brief description of the drawings In the drawings:

40 FIG. 1 is a schematic view of a modular fog generation system according to a first embodiment of the invention.

FIG. 2 is a schematic view of a modular fog generation system according to a second embodiment of the invention.

FIG. 3 is a schematic view of a modular fog generation system according to a third embodiment of the invention.

FIG. 4 is a schematic view of a modular fog generation system according to a fourth embodiment of the invention.

FIG. 5 is a partial perspective view of a modular fog generation system according to any embodiment of the invention mounted on a vacuum cleaner.

50 FIG. 6 is a perspective view of a modular fog generation system according to any embodiment of the invention mounted on an extraction cleaner.

FIG. 7 is a perspective view of a modular fog generation system according to any embodiment of the invention mounted on a flat mop.

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FIG. 8 is a perspective view of a modular fog generation system according to any embodiment of the invention mounted on a hand duster.

FIG. 9 is a schematic view of a vacuum cleaner shown in FIG. 5.

Detailed description

The present invention relates to a modular fog generation system for a cleaning device. The modular fog generation system can be adapted to generate a finely atomized liquid mist to suppress dust, allergens and other airborne particles. In addition, the modular fog generation system can be adapted to deodorize the atmosphere surrounding the modular system and / or apply a treatment to a surface to be cleaned near the modular system. The modular fog generation system can be adapted to adapt to many cleaning products such as vacuum cleaners, extraction cleaners, dust mops and hand tools, for example, to suppress airborne dust and particles generated during operation. The atomized liquid mist may comprise a composition adapted to deodorize and neutralize odors on the surface to be cleaned, or to agglomerate the powder. Alternatively, the fog composition may be configured to apply a treatment to the cleaning surface, such as a detergent for cleaning the surface, a disinfectant agent, a coalescing or flocculating agent to agglomerate and suppress airborne dust or an acaricide for kill dust mites on the surface to be cleaned, for example.

Fig. 1 is a schematic view of a modular fog generation system 10 according to a first embodiment of the invention. The mist generation system 10 comprises a housing 12 with a mounting feature such as a depressed cavity 14 formed in an upper wall thereof to selectively receive a refillable liquid supply tank 16. The tank 16 can be molded in transparent thermoplastic material and comprises a generally circular shape with a peripheral side wall 18 and a closed upper wall 20 and lower wall 22. The tank 16 may further comprise a cylindrical opening 24 in the center thereof that is configured to surround an elevated cylindrical rib 26 protruding upward from the center of the cavity 14.

A valve mechanism 28 can be provided to control the flow of liquid from the tank 16 and is selectively received within an outlet defined by a neck 30 threaded into the bottom wall 22 of the tank 16 and is retained thereon by a cover 36 The cavity 14 may comprise a valve seat 40 that engages with the valve mechanism 28. The valve mechanism 28 may comprise a conventional plunger valve in which a spring is adapted to divert a valve member to a closed position to prevent the liquid 56 kept in the tank 16 from leaving. However, when the tank 16 is seated inside the cavity 14, the valve member is diverted to an open position in which the liquid can exit the tank 16 by gravity. When the tank 16 is removed from the cavity 14 and reversed, the retaining cap 36 can be unscrewed and the valve 28 can be removed to fill the inverted tank 16 by pouring liquid through the opening defined by the threaded neck 30.

A fluid conduit 46 is fluidly connected between the valve seat 40 and an outlet tab 48. The outlet tab 48 comprises a small outlet opening 50 that is adapted to control the flow of liquid from the tank 16 to an atomization chamber 52, which can be embedded in an upper wall of the housing 12 and further defined at least in part by the cylindrical rib 26 protruding upwards from there.

The liquid 56 maintained in the tank 16 may comprise water. Alternatively, the liquid may comprise a composition containing water and one or more additives such as fragrance, deodorizing agents, odor neutralizing agents, cleaning detergents comprising surfactants or peroxygen components, various surface treatments such as acaricide, disinfectant agents, surfactants , or coalescing or flocculating agents to suppress and agglomerate the powder, for example. The following examples are for exemplary purposes only and should not be construed as limiting the invention disclosed herein: a suitable odor neutralizing agent may comprise undecylenic acid; Suitable disinfectant agents may comprise EPA-free natural disinfectants such as botanical disinfectants comprising one or more essential oils such as thyme, mint, cinnamon, lemongrass, clove, patchouli, eucalyptus or other natural oils; suitable surfactants may comprise nonionic, anionic or cationic surfactants commonly known in the art; and a suitable coalescing or flocculating agent may comprise a liquid polymer or other liquid dispensable agent that is adapted to form bonds between aggregate dust particles to agglomerate the powder and reduce airborne particles. In addition, the disinfectant agent may comprise one of: quaternary ammonium compounds (quats), such as dialkyl quats, mixtures of dialkyl quats, single chain quats and double chain quats, hydrogen peroxide or hydrogen peroxide derivatives or colloidal particles with properties of disinfection or sanitation, including silver and / or copper. A suitable miticidal agent may comprise benzyl benzoate as further disclosed in US Patent No. 6,376,542 to Hansen et al. These potential additives can be mixed in the composition and dispersed in a water vehicle.

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The composition may be supplied in premixed form and poured directly into the tank 16, or the additive may be mixed with water in the tank 16. Alternatively, the fog generation system 10 may comprise an auxiliary tank (not shown) that is adapted to contain the liquid additive and is fluidly connected to an associated mixing system (not shown) that is configured to mix the auxiliary tank additive with water from tank 16 in a desired mixing ratio before dispensing the mixture into the chamber 52 of atomization through the valve 28. Although not shown, the tank 16 may further comprise a filter to filter the liquid 56 before discharging it through the valve 28.

The vertically oriented atomization chamber 52 comprises a well chamber 58 in a lower portion and a steam chamber 60 in an upper portion thereof. A cylindrical fog generator 62 is hermetically mounted within a lower portion of the well chamber 58, coaxial with the atomization chamber 52. The upper part of the fog generator 62 is spaced below the outlet tab 48 to accommodate a reservoir 64 of liquid formed between the upper surface of the fog generator 62 and the outlet tab 48. The liquid reservoir 64 receives liquid from the tank 16 through the outlet tab 48 of the fluid conduit 46. The upper part of the fog generator 62 may be along a horizontal plane, perpendicular to the side walls of the atomization chamber 52, or alternatively, it may be angled with respect to the lateral walls of the atomization chamber 52. The liquid reservoir 64 is adapted to contain the liquid from the tank 16 at a coplanar level with the outlet tab 48 as will be described below. The steam chamber 60 extends upwardly from the top of the liquid reservoir 64 to one or more fog outlet openings 66 in the upper opening of the cylindrical rib 26, which is open to the atmosphere. Therefore, when the volume of liquid inside the tank 16 is greater than or equal to the volume of liquid maintained in the tank 64, a hydrostatic equilibrium is created that maintains the level of liquid in the tank 64 at a constant level below tab 48. The downward atmospheric pressure on the liquid inside the tank 64 counteracts the downward pressure of the liquid and the negative head space pressure inside the tank 16, which results in a hydrostatic equilibrium.

In one embodiment, the fog generator 62 may comprise a transducer 68 further comprising a piezoelectric disk-shaped element 70 that is adapted to convert signals received from an electronic controller 72 into mechanical vibrations. Although a single transducer is shown in the figures, it is contemplated that the invention may comprise a plurality of transducers. A flexible and waterproof membrane 74, commonly referred to as a wear plate, can be attached to the piezoelectric element 70 at the top of the transducer 68 to protect the piezoelectric element 70 from wear and moisture. The membrane 74 is adapted for direct exposure to liquid in the tank 64. The diameter of the piezoelectric element 70 may be from about 15 mm to 75 mm; however, the size can be adjusted depending on the volume of the liquid reservoir 64 to be atomized and the dimensions of the well chamber 58. The transducer 68 is operatively connected to a control circuit 76 comprising the electronic controller 72 that is operatively connected to a power source 78 through conductive wires 80 and a power switch 81. The electronic controller 72 may comprise a conventional PCB assembly configured to provide output signals to the piezoelectric element 70. The power switch 81 may be remote from the modular fog generation system 10, or it may be mounted on a part of the system 10, such as the housing 12. The power source 78 may comprise alternating current (AC) from an outlet residential, a voltage tapping circuit connected to field windings of a conventional electric motor assembly, or direct current (DC) power that is either converted by a transformer or supplied by a battery pack, for example. The piezoelectric element 70 can be adapted to vibrate within a frequency range of 5.0kHz-2.5MHz and preferably to 1.7MHz to convert low viscosity liquid into fine mist particles with diameters ranging from 10 microns (m) to 100 microns ( m). The piezoelectric element can be energized continuously, or optionally can be energized intermittently to vary the rate of fog flow. For example, the duty cycle of the piezoelectric element may comprise being adjustable to selectively vary the fog flow rate. Although the description here relates to a piezoelectric element positioned below a permanent well chamber, the alternate configurations are within the scope of the invention. For example, the piezoelectric element 70 could comprise a piezoelectric element in the form of a perforated disc positioned on the top of a permanent well chamber as is known in the field of the piezoelectric atomizer of the art.

A dome-shaped guide cover 82 can be mounted above the fog exit openings 66. The cover 82 can be supported by one or more mounting legs 84 that extend upwardly from the rib 26. The guide cover 82 can be removable from the mounting legs 84 for access, removal and installation from the tank 16. Alternatively, The mounting legs 84 can extend upwardly from any location of the housing 12 or from the tank 16, or the guide cover 82 can be pivotally mounted in the housing 12 through a connecting leg (not shown) which is connected from pivotally to the housing 12 through a pin joint (not shown), which allows the guide cover 82 to be pivoted back for user access, removal and installation of the tank 16. The guide cover 82 comprises an arcuate lower surface 90 which extends outward and downward from the center of the cover 82 towards an outer edge 92 and is adapted to guide the atomized mist 96 floating through the opening 66 of sa lida carried by connective forces along a path outward and downward, away from the housing 12.

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Optionally, as shown in FIG. 1, the modular fog generation system 10 may comprise a fan 94 adapted to generate an air flow to blow atomized mist 96 along a desired path. The fan 94 can be driven by an electric motor or an air turbine (not shown) as is commonly known in the art. The fan 94 can be located inside the steam chamber 60 to pull atomized mist 96 upwards and blow it against the lower surface 90 of the cover 82 and direct it through the opening 66. Air can be transported to the chamber 60 of steam through an inlet 98 located below the fan 94. Alternatively, the fan 94 may be placed above or outside the mist exit opening 66 to pull atomized mist 96 through the opening 66. In one configuration, the Inlet 98 can be oriented along an upward spiral path to impart an upward swirling motion to the atomized mist 96. Alternatively, the air flow can enter the steam chamber 60 above the outlet opening 66 through at least one inlet 98 inclined downward and oriented to blow the atomized mist along a downward and outward path. towards the outer edge 92 of the cover 82 and the housing 12.

The housing 12 of the modular fog generation system 10 may further comprise at least one light emitting diode (LED) 102 mounted to illuminate the droplets of atomized fog that are ejected from the atomization chamber 52. The LED 102 may be electrically connected to the power source 78 through the control circuit 76 and configured to receive power when a user turns on the power switch 81 "ON" to energize the fog generator 62. The LED 102 can be mounted in a variety of locations in the housing 12 to provide the desired lighting effect. For example, in the illustrated embodiment, two LEDs 102 can be mounted in the housing 12 adjacent to the tank 16 and outside the cavity 14 and configured to direct the light upward to illuminate the atomized mist 96 emerging from the outer edge 92 of the coating 82 Alternatively, the LEDs 102 may be placed in the cavity 14 under the transparent tank 16, within the atomization chamber 52, or in the cover 82.

In operation, a user fills the tank 16 with liquid through the opening defined by the threaded neck 30 after first removing the retaining cap 36 and the valve mechanism 28. The user then reinstalls the valve mechanism 28 and inserts the tank 16 into the depressed cavity 14 over the housing 12 by sliding the cylindrical opening 24 around the raised cylindrical rib 26 protruding from the housing 12 and seating the valve mechanism 28 inside of the valve seat 40, which moves the valve mechanism to a position where the liquid can exit the tank 16 by gravity. Liquid flows into the well chamber 58 through the fluid conduit 46 and the outlet tongue 48, and fills the well chamber 58 above the piezoelectric element 70 of the transducer 68 until it reaches a coplanar level with the tongue 48 of exit. The downward atmospheric pressure on the liquid inside the tank 64 counteracts the downward pressure of the liquid and the negative head space pressure inside the tank 16, resulting in a hydrostatic equilibrium that maintains the level of liquid inside the tank 64 at a relatively level constant, substantially coplanar with the output tab 48.

Next, by connecting the modular fog generation system 10 to a power source, such as a residential outlet or a battery pack, a user can selectively activate the fog generator 62 by operating the power switch 81, which , in turn, energizes the control circuit 76 and the controller 72. The electronic controller 72 sends electrical signals through wires 80 conductors to the piezoelectric element 70 mounted within the transducer 68. The piezoelectric element 70 and the membrane 74 vibrate at a frequency predetermined below the liquid that is in the tank 64. The vibration generates waves that push upward through the existing liquid. As the waves push through the liquid, they generate a small source that releases droplets 96 of atomized liquid mist from the surface of the same to the steam chamber 60. Drops 96 of atomized fog float upward through the steam chamber 60 by connective forces and flow through the outlet opening 66. The arcuate lower surface 90 of the cover 82 guides the fog drops down and out towards the outer edge 92 thereof. Fog drops continue downward and outward towards the perimeter of the housing 12. If the modular fog generation system 10 comprises the fan 94, the air flow generated by the fan 94 enters the steam chamber 60 through the inlet 98 and the fog droplets 96 blow through the outlet opening 66 and along the desired path towards the periphery of the housing 12. The LEDs 102, which are activated when the user engages with the Power switch 81 to the "ON" position, illuminate the droplets 96 of fog as they move along the path.

Some of the droplets of atomized mist ejected from the modular fog generation system 10 collide with dust particles suspended in the air. The atomized fog wets the dust particles, which increases the mass of the dust particles and throws the wet particles to the ground. Consequently, the modular fog generation system 10 reduces the amount of airborne particles in the vicinity of the modular fog generation system. As the droplets of atomized fog continue along their trajectory, they eventually fall from the atmosphere to the cleaning surface. Accordingly, when the liquid 56 contains various additives as described above, such as detergents, odor neutralizers, disinfectants, detergents or other treatments such as acaricides or flocculating agents, for example, the modular fog generation system 10 can be used to apply those compositions to the surface to impart the desired treatment or properties thereon. However, because the compositions are applied to the surface in the form of atomized fog, the surface does not become too wet or saturated in

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comparison with conventional liquid aerosols that have much larger droplet sizes. For example, the diameter of the atomized mist 96 ejected by the fog generation system 10 may be about 10 microns to 100 microns, while the droplet diameter of the liquid atomization of an extraction cleaner is generally greater than 100 microns .

FIG. 2 shows a modular fog generation system 200 according to a second embodiment of the invention in which similar characteristics are indicated by the same reference number symbol. The fog generator system 200 is substantially identical to the fog generation system 10 shown in Fig. 1, except that the valve seat 40 is fluidly connected to a pump 202 and a downstream atomization nozzle 204 that are connected fluidly by tube 206 which is tightly secured between them. Pump 202 may comprise a conventional centrifuge or solenoid design as is commonly known in the art.

The atomization nozzle 204 comprises an elongated, cylindrical piezoelectric transducer probe 208, a liquid inlet 210 and a nozzle outlet 212 that is fluidly connected to the liquid inlet 210 through a hollow chamber 214 that extends along a longitudinal axis The inlet 210 is fluidly connected to the pump 202 through the tube 206. In this way, a liquid flow path is formed along the hollow chamber 214 of the nozzle 204, from the inlet 210 to the outlet 212 of nozzle. The nozzle outlet 212 may comprise at least one outlet hole 222. The exit hole 222 can be coaxial with the liquid flow path, or, alternatively, the hole 222 can be oriented along a divergent axis from the hollow chamber 214. For example, as shown in FIG. 2, the outlet hole 222 may be formed by a plurality of small holes drilled in the nozzle 204 perpendicularly and radially to the hollow chamber 214.

The probe 208 extends into the nozzle 204 through the chamber 214, and includes a proximal end that forms a probe tip 220 and a distal end 216. The probe tip 220 may be positioned at the nozzle outlet 212 adjacent to the hole 222 which may further comprise a convex shape to generate a desired fog atomization pattern and a fog path. The design of the nozzle outlet 212 can influence the trajectory, the atomization pattern and the coverage area of the atomized fog. For example, an exit coaxial hole 222 combined with a convex probe tip 220 can generate a dome or umbrella shaped fog path while a radial nozzle exit hole 222 can generate a predominantly horizontal radial fog path. The probe is preferably constructed of rigid, corrosion resistant material, such as stainless steel or titanium, for example.

The distal end 216 of the probe 208 is housed within a cylindrical base portion 224 of the housing 12 that also houses one or more piezoelectric elements 226 in electronic register with the probe 208. The piezoelectric elements 226 are operatively connected to the controller 72 and they are configured to convert the electrical signals of the controller 72 into a mechanical vibration which, in turn, is transmitted to the probe 208 to atomize the liquid from the tank 16 that is propelled through the chamber 214 by the pump 202.

The atomization nozzle 204 is oriented vertically with respect to the housing 12 so that the longitudinal axis of the chamber 214 is generally orthogonal to the substantially horizontal housing 12. As shown in FIG. 2, the probe 208 protrudes upwardly from the housing 12, so that the nozzle outlet 212 is located at a predetermined vertical distance D above the upper wall 20 of the tank 16 when the tank 16 is seated in the housing 12. The vertical distance D can be selected to achieve a desired fog path and an atomization pattern. Several variables can influence the selection of the vertical distance D, including the nozzle outlet configuration, the dimensions of the tank, the dimensions of the housing, the oscillation frequency of the transducer and the pump flow rate, for example . The above description is for exemplary purposes and should not be construed as limiting the invention to a specific atomization nozzle mounting configuration. For example, the atomization nozzle 204 may be inverted, with the nozzle outlet 212 pointing down. Accordingly, the atomization nozzle 204 can be mounted on a support structure that extends above the housing 12 and is adapted to separate the nozzle outlet 212 above the housing 12 and the tank 16.

In operation, a user prepares the modular mist generation system 200 for use by filling the tank 16 with liquid and settling it in the housing 12. The valve mechanism 28 is coupled to the valve seat 40, thereby fluidly connecting the tank 16 to the pump assembly 202 and the atomizing nozzle 204 through the tube 206. Next, a user connects the system to the power source 78 and actuates the remote power switch 81 to energize the controller 72 and the pump 202 The controller 72 sends electronic signals to the piezoelectric elements 226 and the piezoelectric elements 226 convert the electrical signals from the controller 72 into mechanical vibrations that are transmitted to the probe 208.

The pump 202 drives the liquid from the tank 16 to the inlet 210 through the liquid supply tube 206 that fluidly connects the components. The liquid is pumped through the chamber 214 to the nozzle outlet 212. As the liquid reaches the exit orifice 222, the ultrasonic vibrations atomize the liquid in ultrafine mist drops and distribute them in the surrounding atmosphere along a predetermined fog path. The radial holes of the exit hole 222 distribute the fog droplets 96 in a pattern in

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disk shape that follows a generally horizontal and slightly downward path towards the perimeter of the housing 12 as illustrated in Fig. 2.

Although the atomization nozzle 204 disclosed herein comprises a hollow, cylindrical and elongated transducer probe 208 that forms the liquid flow path 218 therethrough, this is for example purposes and the additional configurations are within the scope of the invention. For example, transducer probe 208 may be an elongated, solid member, and the liquid flow path can be formed through a liquid supply tube located next to, and along, the length of the probe. The liquid supply tube can be adapted to distribute liquid at the tip of the probe. A more complete description of this configuration can be found in United States Patent No. 4,085,893. Fig. 3 is a schematic view of a modular fog generation system 300 according to a third embodiment of the invention where similar features are indicated by the same reference numbers. The mist generator system 300 is similar to the mist generator system 200 shown in Fig. 2, except that a filter 304 is positioned in line between the pump 202 and an atomization nozzle 306. The flexible tube segments 206 are connected in a sealed manner between the aforementioned components to form a liquid flow path, which includes the filter 304, therethrough. In addition, an atomization nozzle 306 is used instead of the atomization nozzle 204, and may comprise a low pressure mist nozzle adapted to distribute an atomized liquid mist to suppress dust, deodorize a cleaning surface or apply an atomized composition to a surface to be cleaned. The nozzle 306 can be fixed in an upward orientation in relation to the housing as shown, or alternatively, the position of the nozzle can be adjustable in relation to the housing, or it can be oriented transversely or towards the surface to be cleaned. The nozzle 306 may comprise a variety of commercially available mist nozzles, such as impact nozzles, low pressure mist nozzles, and plastic mist nozzles currently available in
http://www.i-spraynozzle.com, for example. The nozzle 306 may comprise an outlet hole 308 with a diameter ranging from 0.1 mm to 0.5 mm. At least one commonly known check valve (not shown) can be incorporated into the tube 206 between the nozzle 306 and the pump 202 to prevent liquid leakage through the outlet orifice 308 when the pressure in the tube 206 is below a default threshold In addition, the control circuit 76 may comprise only switch 81 and power source 78. Alternatively, the control circuit 76 may comprise a controller 72 that is adapted to vary the frequency or duty cycle of the pump 202 to selectively adjust the fog flow rate through the nozzle 306. It may be desirable to vary the rat of fog flow, depending on the type of liquid 56 that is distributed. For example, a relatively low flow rate of approximately 4 ml / min - 10 ml / min may be desired when the liquid 56 comprises a deodorant, while a relatively greater flow rate of approximately 40 ml / min - 200 ml may be desired. / min to ensure the effectiveness of the treatment when the liquid 56 comprises a disinfectant agent. Consequently, the liquid supply system can be scalable and can be configured with variable flow rat means adapted to accommodate a wide variety of liquids and applications. Any embodiment of the invention described herein may comprise a controller for varying the fog flow rate. In addition, the specific flow rate ranges described previously are for example purposes only and should not be construed as limiting the scope of the invention. In addition, the flow rate can be varied by alternative means commonly known in the art of liquid extraction floor cleaner, such as incorporating multiple liquid supply tanks or multiple selectively attachable liquid flow paths, or separate pumps, for example, They adapt to selectively increase the rate of flow of liquid and fog.

The operation of the fog generation system 300 is generally the same as for the fog generation system 200, except that the pump liquid 202 is forced through the in-line filter 304, which is configured to trap any small dirt to avoid obstructing the atomization nozzle 306 that is downstream of the filter 304. The liquid is introduced into the atomization nozzle 306, where the droplets of atomized mist 96 are distributed through the outlet orifice 308 to the surrounding atmosphere. As previously described, the droplets of atomized mist 96 can agglomerate dust particles suspended in the air and drop them to the ground while optionally imparting various treatments to the cleaning surface such as deodorizing agents and disinfectants.

FIG. 4 shows a modular fog generation system 400 according to a fourth embodiment of the invention. In this embodiment, the tank 16 has a closed lower wall 22 and an open neck 408 defining an opening formed in the upper wall 20. A sealing cap 406 is adapted to be selectively secured and sealed to the open neck 408 through threads or bayonet fasteners, for example. The cover 406 comprises a plurality of holes 410 formed therethrough which are sized to receive air and water pipes sealed therethrough. A vertically oriented air inlet tube 414 comprises an upper portion with an air inlet 416 extending upwardly out of the cover 406. The air inlet tube 414 further comprises a lower portion with an air outlet 220 which is open into the tank 16. The air outlet 220 protrudes into the tank 16 at a depth slightly below the lid 406. The air inlet 416 is fluidly connected to an air pump 422 through a path 424 of air formed between them, such as by tubes or ducts (not shown). The air outlet 220 communicates fluidly with an air chamber 426 inside the tank 16 comprising the volume of gas above the liquid level 56 in the tank 16 commonly referred to as "head space."

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An air outlet tube 430 is mounted through the lid 406 and comprises an upper portion with an exhaust air outlet 434 protruding from the lid 406 and a lower portion with an exhaust air inlet 438 protruding into the tank 16 at the same depth as the air inlet tube 414. The exhaust air inlet 438 communicates fluidly with the air chamber 426 and the exhaust air outlet 434 is fluidly connected to an air-liquid atomization spray nozzle 44 downstream through a formed air path 436 between them, such as by pipe or conduits (not shown).

A liquid outlet tube 444 is mounted through the lid 406 and comprises an upper portion with a liquid outlet 448 protruding from the lid and a lower portion with a liquid inlet 452 that extends into the tank 16 and is adjacent to the bottom wall 22 of the tank 16. The liquid inlet 452 may comprise an angled tip 454 that prevents the tube 444 from being sealed against the bottom wall 22 of the tank 16. The liquid outlet 448 is fluidly connected to the air-liquid atomization spray nozzle 442 downstream through a liquid path 456 formed between them, such as by tubes or ducts (not shown).

The air-liquid atomization spray nozzle 442 comprises a cylindrical body 458 with a coaxial air inlet port 460 in communication with the air outlet tube 430 through the air path 436, an inlet port 462 liquid mounted on the cylindrical body 458 in communication with the liquid outlet tube 444 through the liquid path 456, and an outlet 464 of atomized liquid at the distal end. The liquid inlet port 462 can be oriented perpendicularly to or at an acute angle to the axis of the cylindrical body 458. The air and liquid inlet ports 460, 462 are fluidly connected to the liquid outlet port 464 through a mixing chamber 466 that is adapted, rotates and mixes the air and incoming liquid flow streams, to generate an atomized liquid-air mist that can be distributed through the outlet 464 of atomized liquid. The air-liquid atomization spray nozzle 442 can be mounted in the housing 12 in a variety of orientations depending on the mist path and the desired atomization pattern. For example, the nozzle 442 can be mounted in the housing 12 so that the outlet 464 points upwards or horizontally with respect to the housing 12. Alternatively, the nozzle 442 can be mounted on top of the housing 12 on a support structure and oriented with the exit 464 pointing down (not shown) towards the surface to be cleaned. In yet another configuration, the nozzle 442 can be adjustable relative to the housing 12. In addition, multiple nozzles can be fluidly connected to the air outlet tube 430 and the liquid outlet tube 444 through conventional T-connectors or a collector At least one commonly known check valve (not shown) can be incorporated in the air and liquid paths 436, 456 upstream from the nozzle 442 to prevent liquid leakage through the outlet port 464 when the pressure in the air and the Liquid flow paths 436, 456 are below a predetermined threshold.

The air pump 422 is adapted to generate a pressurized air flow. The pump 422 is operatively connected to the power source 78 through wires 80 conductors and the power switch 81. The pump 422 may comprise a conventional piston pump or diaphragm pump design, as is well known in the art. Alternatively, the pressurized air source may comprise a pressure vessel with a selectively attachable outlet valve, such as a conventional CO2 cartridge or an aerosol container, for example.

In operation, a user removes the cover 406 and the associated inlet air inlet tube 414, the liquid outlet tube 444, and the air outlet tube 430, and fills the tank 16 with liquid 56 to be atomized. The user secures the cover 406 and the tubes 414, 444, 430 associated with the neck 408 and seats the tank 16 in the housing 12. Next, a user activates the power switch 81 to energize the air pump 422. The air pump 422 generates air flow through the air path 424, through the air inlet 416 and the air inlet tube 414 and in the air chamber 426 through the air outlet 220. The incoming air pressurizes the air chamber 426 on the liquid 56 that is in the tank 16, which forces the liquid and the air through the liquid outlet tube 444 and the air outlet tube 430 respectively. The positive pressure in the air chamber 426 forces the liquid 56 through the angled tip 454 of the liquid inlet 452, upwardly through the liquid outlet tube 444, and out of the liquid outlet 448 to the path 456 of the liquid that is connected to the liquid inlet port 462 of the spray nozzle 442.

Pressurized air flows to the exhaust air inlet 438, through the air outlet tube 430 that is spaced above the liquid 56 in the tank 16, and is discharged into the air path 436 through the outlet 434 of exhaust air. Pressurized air flows to the air inlet 460 which is coaxial with the cylindrical body 458 of the atomizing nozzle 442. Pressurized air flows into the mixing chamber 466 and collides with the pressurized liquid that simultaneously flows into the mixing chamber 466 through the liquid inlet port 462. The liquid and the pressurized air rotate and mix together inside the mixing chamber 466 and are distributed in the surrounding atmosphere through the outlet 468 of atomized liquid like drops 96 of pressurized and atomized fog. As previously described, droplets of atomized mist 96 can agglomerate dust particles suspended in the air and drop them to the ground while optionally imparting various treatments to the cleaning surface.

The 10, 200, 300, 400 modular fog generation systems disclosed herein can be adapted for mounting on a wide variety of cleaning implements or devices. For example, as shown in FIG. 5, the

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Modular fog generation system can be mounted on a vacuum cleaner 500. A detailed description of a vacuum cleaner can be found in, for example, US Pat. No. 7,811,349. Although not shown here, the fog generation system 10, 200, 300, 400 can also be mounted on a foot or on a body part of a canister or portable handheld vacuum. In addition, modular fog generation systems 10, 200, 300, 400 may be mounted at least partially inside the housings of any of the cleaning devices described herein, so that only the necessary components, such as the tank, are exposed of liquid supply and atomization nozzles, for example.

As illustrated here, the vacuum 500 is a vertical vacuum 500 comprising a vertical handle assembly 506 that is pivotally connected to a base assembly 508 to direct the base assembly 508 through the surface to be cleaned . The vertical handle assembly 506 comprises a main body 510 that houses a suction source (not shown) that is fluidly connected to a collection system 512 for separating and collecting contaminants from an operating air stream for later disposal. In a conventional arrangement illustrated here, the collection system 512 may include a separator 514 integrally formed of cyclone and a cup 516 of dirt that is separable from the handle assembly 506 as a module. The dirt cup 516 may be provided with a bottom opening dirt door for removal of contaminants. In another conventional arrangement, the collection system 512 may include a cyclone separator for separating contaminants from a working air stream and a removable dirt cup for receiving and collecting contaminants separated from the cyclone separator. In another conventional arrangement, the collection system 512 may include a filter bag. The vacuum 10 may also be provided with one or more additional filters upstream and / or downstream of the collection system 512.

The base assembly 508 further comprises a base housing 518 with a floor suction nozzle 520 located below a front portion thereof. A stirrer assembly (not shown) encompasses the suction nozzle opening and is rotatably supported therein and adapted to selectively agitate the surface to be cleaned. The agitator may be operatively connected to a motor / fan assembly (not shown) as is commonly known in the art. The suction nozzle 520 is adapted to move along a surface to be cleaned and is rotatably supported by one or more wheel assemblies 542 secured to the base housing 518.

With reference to FIG. 9, which is a schematic view of the vacuum cleaner 500 shown in FIG. 5, the suction nozzle 520 is fluidly connected to the collection system 512 to collect the separated dust and debris. The collection system 512 is fluidly connected to a downstream suction source comprising a motor / blower assembly 534 that is adapted to generate a working air flow through the vacuum 500. The motor / assembly 534 / Blower is operatively connected to a power circuit 536. The power circuit 536 may comprise a power cable 538 connected to a motor protection system 550 that is adapted to disconnect the electrical power from the motor / blower assembly 534 when a predetermined amount of liquid is ingested through the nozzle 520 of suction, in the working air path and in the 512 collection system. The power cable 538 can be selectively connected to a conventional residential power outlet to supply electricity through the motor protection system 550 to the motor / blower assembly 534 and, optionally, to other electrical components connected to the power circuit 536, such as the 10, 200, 300, 400 modular fog generation system. The suction source is fluidly connected to an exhaust chamber comprising a plurality of exhaust vents 528 to expel the separated working air into the ambient atmosphere.

In one embodiment, shown schematically in Figure 9, the motor protection system 550 may comprise a microswitch 552 mounted inside the vacuum 500 in register with and adapted for selective actuation by an expandable filter 554 prior to the engine. The expandable filter 554 prior to the engine detects moisture in the air moving through it and can cut the flow of potentially harmful moist air to the motor / blower assembly 534. The microswitch 552 may be normally closed and is operatively connected within the power circuit 536 to selectively control the electricity of the motor / blower assembly 534 and, optionally, of the modular fog generation systems 10, 200, 300, 400 depending on the status of filter 554 prior to the expandable motor.

The expandable filter 554 prior to the motor can be fluidly connected within the working air path and mounted inside a filter chamber (not shown) that is upstream of the inlet of the motor / blower assembly 534 and downstream of the system 512 of collection. The pre-engine expandable filter 554 may comprise a filter element 556 adjacent to an expansion element 558. The filter element 556 is adapted to filter fine particles out of the working air stream before ingestion by the motor / blower assembly 534 and may comprise commonly known air filtration means such as open cell foam media or High efficiency particulate air filter (HEPA), for example.

The expansion element 558 is adapted to absorb and retain moisture. The expansion element 558 is further configured to swell, expand and operate the microswitch 552 when the expansion element 558 absorbs an amount of moisture above a predetermined threshold. In one embodiment, the expansion element 558 may comprise superabsorbent polymer (SAP) material. For example, the expansion element 558 may comprise a non-woven SAP fiber material or a filter media of

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Conventional particles coated with a SAP powder. The expansion element 558 may form a layer that encompasses the entire expandable filter 554 prior to the motor as shown in Figure 9, or a sleeve surrounding the filter element 556. Alternatively, the expansion element 558 may comprise an insert that forms a localized area or a discrete portion of the expandable filter 554 prior to the engine. Alternatively, the filter element 556 can be combined with the expansion element 558 in the same component that provides both particle filtration and moisture expansion characteristics.

The modular fog generation system 10, 200, 300, 400 can be fixedly mounted in the base housing 518 as shown in FIG. 5, or to the main body 510 through conventional fasteners, such as screws, for example, or by other conventional fastening methods, such as pressure adjustment, for example. Optionally, the housing 12 of the fog generating system 10, 200, 300, 400 can be integrally formed in the base housing 518 or in the main body 510. The modular fog generation system 10, 200, 300, 400 is operatively connected to the power circuit and the power cable 538 and can be energized through the remote power switch 81 to operate simultaneously with the suction source. Optionally, the modular fog generation system 10, 200, 300, 400 can be connected to the power circuit through a separate power switch (not shown) so that the system can be energized independently of the motor / blower assembly 534.

During operation, an operator connects the power cable 538 of the vacuum cleaner to a power source. The operator operates the power switch 81 to energize the suction source and the modular mist generation system 10, 200, 300, 400. The suction source generates a working air flow through the separation and collection system 512 while simultaneously rotating the agitator. The rotating agitator lifts debris from the surface to be cleaned and drags it into the working air flow. Debris is transported through cyclone separator 514 and collected in dirt cup 516 for later disposal. The work air flow passes through the expandable filter 554 prior to the engine, engine / engine blower assembly 534, where the flow of filtered work air is expelled through the exhaust vents 528, into the surrounding atmosphere . As the agitator rotates, it disrupts the cleaning surface, causing dust, debris and other allergens trapped on the cleaning surface to float upwards. The resulting airborne particles contaminate the ambient air surrounding the vacuum 500.

The modular fog generation system 10, 200, 300, 400 converts the liquid 56 of the tank 16 into the atomized mist drop 96 as previously described. Drops 96 of atomized fog wet the dust and other airborne particles surrounding the base assembly 508, causing them to fall to the floor to be ingested by the vacuum cleaner 500 through the suction nozzle 520. Atomized fog thus creates a barrier that reduces operator exposure to dust and undesirable allergens suspended in the air. Various additives, such as fragrances, detergents, peroxides and other compositions can be added as described hereinbefore to the liquid for improved performance.

During use, however, it is possible that the droplets of atomized mist 96 are ingested through the suction nozzle 520 together with the working air flow, in the working air path and in the water collection system 512 down. The motor protection system 550 is adapted to disconnect the electric power from the motor / blower assembly 534 and, optionally, to the modular fog generation systems 10, 200, 300, 400 if a sufficient volume of moisture is ingested into the working air path.

As described above, when the working air leaves the separator 514, it flows through the expandable filter 554 prior to the engine. The filter element 556 traps the remaining fine particles in the working air stream, while the expansion element 558 absorbs and retains any moisture contained in the work air flow, such as droplets of fog 96. The expansion element 558 swells and expands as it absorbs moisture. The expansion element 558 is configured to swell and activate the motor protection system 550 when it absorbs a volume of moisture above a predetermined threshold. In that case, a surface of the expansion element 558 expands upwards and contacts the microswitch 552, which drives the microswitch 552 and opens the power circuit 536 connected to the motor / blower assembly 534 and, optionally, to the system 10, 200 , 300, 400 of modular fog generation. An operator may restore the motor protection system 550 by replacing the filter 554 prior to the spent expendable motor complete with an expandable filter 554 prior to the unused engine, or simply replacing a portion thereof, provided that the expansion element 558 can be independently replaced. of filter element 556.

FIG. 6 is a perspective view of the modular fog generation system 10, 200, 300, 400 mounted on an extraction cleaner 600. A representative example of a wet extraction cleaner can be found in US Pat. No, 6,131,237. As illustrated herein, the extraction cleaner 600 is a vertical extraction cleaner 600 comprising a vertical handle assembly 606 that is pivotally connected to a base assembly 608 to direct the base assembly 608 through the surface that It is going to be cleaned. As shown, the fog generation system 10, 200, 300, 400 is mounted in the base assembly 608. The modular fog generation system 10, 200, 300, 400 can be mounted in the housing of the base assembly 608 in a manner substantially similar to that previously described with respect to the vacuum cleaner 500 (Fig. 5). Alternatively, the fog generation system 10, 200, 300, 400 can be mounted in the assembly 606 of

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handle. Although not shown here, the fog generation system 10, 200, 300, 400 can also be mounted on a foot or on a body part of a boat or a portable handheld extraction cleaner.

FIG. 7 at a perspective view of a modular fog generation system 10, 200, 300, 400 mounted on a flat 700 mop. Representative examples of dust mops can be found in US Pat. No. 3,778,860, and U.S. Pat. No. 6,484,346. The flat mop 700 comprises a vertical bar handle 702 that is rotatably connected to a rectangular cleaning head 704 to maneuver the cleaning head 704 through a surface to be cleaned. The handle 702 may comprise a handle 706 mounted on the distal end of the handle 702 comprising an elastic material such as an elastomeric material, for example. The handle 702 can be mounted on the cleaning head 704 by means of a conventional universal joint 708 or gimbal joint, which is well known in the art. The cleaning head 704 may further comprise a cushion (not shown) that is fixedly fixed under the cleaning head 704 and adapted to frictionally engage a disposable powder sheet or a cleaning cloth 714 as is well established in the technique.

The cleaning head 704 comprises a housing 710 having at least one elastomeric deformable sheet retention insert 712 in the upper wall of the cleaning head 704. The sheet retention insert 712 may comprise grooves that extend radially in a pattern similar to a radius that forms deformable fins to contain a portion of the cleaning cloth 714. Examples of such retainers are disclosed in US Pat. No. 3,099,855 to Nash and US Pat. No. 7,013,528. The cleaning sheet or cloth 714 can be wrapped around the bottom of the cleaning head 704 and removably retained on the top of the housing 710 by at least one retaining insert 712 of elastomeric deformable mechanical sheet.

As shown in FIG. 7, the fog generation system 10, 200, 300, 400 can be mounted in the housing 710 as previously described. The power source 78 may be provided in the form of a rechargeable battery pack or replaceable battery mounted in any of the housing 710, cleaning head 704 or handle 702. Optionally, the power switch 81 may be provided in the handle 702.

In operation, a user activates the power switch 81 to deliver power from the power source 78 to the modular fog generation system 10, 200, 300, 400. The modular fog generation system 10, 200, 300, 400 converts the liquid 56 of the tank 16 into drops 96 of atomized fog as previously described. When the operator manipulates the handle 706 on the handle 702 to push and pull the cleaning head 704 through the surface to be cleaned, the droplets of atomized fog moisten the dust and airborne particles that are suspended in the air surrounding the cleaning head 704, causing them to fall to the ground for easy collection by the sheet 714 or cleaning cloth mounted at the bottom of the cleaning head 704. Atomized fog thus creates a barrier that reduces operator exposure to dust and unwanted allergens in the air.

FIG. 8 is a perspective view of the modular fog generation system 10, 200, 300, 400 mounted on a duster 800. A representative example of a duster can be found in US Pat. UU. No. 6,047,435. The duster 800 includes a head portion 802 connected to a handle 804. The head portion 802 can be configured to engage a disposable dusting sheet or a cleaning cloth 806. As shown, the modular fog generation system 10, 200, 300, 400 may be mounted in the 802 portion of the head. The power source 78 may be provided in the form of a replaceable battery or a rechargeable battery pack mounted on the handle 804. Optionally, the power switch 81 may be provided on the handle 804.

The term "modular", as used herein with respect to the fog generation system 10, 200, 300, 400 may refer to an autonomous unit that comprises substantially all the components required to generate fog. The modular or autonomous nature of the fog generation system 10 allows variety, interchangeability and flexibility in use, and allows the system 10 to be used with a variety of different cleaning implements and mounted in different positions in the cleaning implement. In addition, the compact size of the fog generation system 10, 200, 300, 400 allows the system 10, 200, 300, 400 to be installed in a cleaning implement without adding a substantial amount of weight or displacing other work components.

Claims (14)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 1. A cleaning tool (500, 600, 700, 800) comprising: a housing for moving on a surface to be cleaned; Y a fog generation system (400) mounted on the housing and comprising: a tank (16) for containing a supply of liquid (56), the tank (16) having a tank inlet (414) and a first tank outlet (444); an atomizer nozzle (442) in fluid communication with the first tank outlet (444) and configured to atomize liquid to form an atomized mist and have a nozzle outlet (464) to atomize the atomized mist; Y an air pump (422) in fluid communication with the tank inlet (414) to supply air to the tank (16); wherein, when the air pump (422) has pressurized the liquid supply (56) in the tank (16), liquid is provided to the atomizer nozzle (442) through the first tank outlet (444) . 2. The cleaning tool of claim 1, wherein the tank (16) further comprises a second tank outlet (430) in fluid communication with the atomizer nozzle (442) for supplying air to the nozzle (442) of atomizer. 3. The cleaning tool of claim 2, wherein the atomizer nozzle (442) comprises a liquid inlet port (462) in fluid communication with the first tank outlet (444) and a port (460) of air inlet in fluid communication with the second tank outlet (430), and the nozzle outlet (464) is in fluid communication with the ports (462, 460) of liquid and air inlet. 4. The cleaning tool of claim 3, wherein the atomizer nozzle (442) comprises a mixing chamber (466) in fluid communication with the ports (462, 460) of liquid and air inlet. 5. The cleaning tool of claim 1, wherein the atomizer nozzle (442) comprises an air-liquid mixing nozzle. 6. The cleaning tool of claim 1, wherein the tank inlet (414) is defined by an inlet tube that extends into a chamber (426) defined by the tank (16), and the first outlet Tank (444) is defined by a first outlet tube that extends into the chamber (426) defined by the tank (16), in which the first outlet tube is longer than the inlet tube. 7. The cleaning tool of claim 6, further comprising a second outlet tube (430) extending into the chamber (426) defined by the tank (16), wherein the first outlet tube (444) It is longer than the second outlet tube (430). 8. The cleaning tool of claim 1, further comprising a power switch (81) operatively connected to the air pump (422) to selectively energize the air pump (422). 9. The cleaning utensil of claim 1, wherein the cleaning utensil comprises a dry vacuum cleaner (500), and the housing comprises a base assembly (508), a pivotally connected handle assembly (506) to the base assembly (508) to direct the base assembly (508) onto the surface to be cleaned, and a collection system (512) to separate and collect contaminants from a running air stream for later disposal, wherein the fog generation system (400) is provided in at least one of the base assembly (508) and the handle assembly (506). 10. The cleaning utensil of claim 1, wherein the cleaning utensil comprises an extraction cleaner (600), and the housing comprises a base assembly (608) and a pivotally connected handle assembly (606) to the base assembly (608) to direct the base assembly (608) onto the surface to be cleaned, in which the fog generation system (400) is provided in at least one of the base assembly (608) and the handle set (606). 11. The cleaning utensil of claim 1, wherein the cleaning utensil comprises a floor mop (700) and the housing comprises a handle (702) coupled with a cleaning head (704) and the system (400) Fog generation is provided in the cleaning head (704). 12. The cleaning tool of claim 1, wherein the cleaning tool comprises a tool (800) for removing portable dust and the housing comprises a handle (804) coupled with a head portion (802) configured to mount a cleaning cloth (806). 13. The cleaning tool of claim 1, wherein the fog generation system (400) is modular and contains the tank (16), atomizer nozzle (442) and the air pump (422) in a housing (12) common. 14. The cleaning tool of claim 1, wherein the cleaning tool comprises a dry vacuum cleaner (500) further comprising a housing (518), and the fog generating system (400) is at least partially mounted inside the housing (518).